List Price: $80.29
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$63.99 USD
Part:   20-403S

AEM 20-403S Intake Bypass Valve

AEM Intake Bypass Valve
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.5
  • Fits 3 inch tubes
  • Secures with two included 1/2 inch wide hose clamps
  • Protects engine from water in cold-air intake systems
  • Installs along the upper portion of the inlet pipe

AEM air bypass valves create a vacuum leak to bypass the air filter in the event that the air filter sucks up water. Air bypass valves are typically installed onto the air intake tube on cold-air intake systems.
Specifications AEM 20-403S Product Specifications
Product StyleAEM Intake Bypass Valve
CARB EO NumberD-670-1
Package Contents1 Bypass Valve
Package Quantity1
Weight1 lb (0.5 kg)
Product Box Height3.63 in (92 mm)
Product Box Length6.13 in (156 mm)
Product Box Width5.88 in (149 mm)
Material UsedNylon
WARNING: Cancer and reproductive
Reviews Product Reviews

JD from Arkansas
June 9, 2014 - Part 20-403S
The AEM intake bypass valve arrived promptly and was a perfect replacement for the original equipment of a [brand] CAI.I am pleased with the product and would recommend it. However, I do think the price could be lowered to below $60 and that this would be reasonable for said product.
David from Ohio
April 3, 2014 - Part 20-403S
The process it took me from ordering to receiving was very quick and easy. The product came with all materials to install and installed easily with the included instructions. This has helped me with my water issue when driving in the rain with a cold air intake. Would recommend to anyone who has a cold air intake and drives daily in wet conditions.